Really really worth it! The VoNG's Ti Tip is downright the best I've used. Really big vapors but also difficult to combust. What's more the stem is super solid.
I will say that my vong came with loose parts at the start, but to fix this you can squeeze the side of the sleeve holding the crown and mouthpiece.
This is really the only Dynavap you'll need I feel. 14mm and 10mm compatible to be used with water piece. Absolutely LOVE IT